Transmitter support for telephone transmitters



Nov. 10, 1925- 1,561,183

H. F.' QBERGFELL TRANSMITTER SUPPORT FOR TELEPHONE TRANSIITTERS Filed Dec. 19. 1921 -4 mwa- Herbe-rtf. Ubarg'f'ell Patented Nov. 10, 1925..

UNITED STATES Meldet ...PATENT QFFIQE.

HERBERT F. OBERGFELL, 0F RIVER FGREST, ILLINGTS, ASSTGNOR TG AUTOMATC ELECTRIC COMPANY, OF CHICAGO, ILLINOS, A CORPORATION 0F ILLNOIS.

TRANSMITTER SUPPRT FOR TELEPHONE TRAIQ'SMBTTERS.

Application led December 19, 1921.

T 0 all' whom t may concern:

Be it known that I, HERBERT F. Onnc- FELL, a citizen of the United States of America, and a resident of River Forest, Cook County, and State of Tllinois, have invented certain new and useful Tmprovements in Transmitter Supports for Telephone Transmitters, of which the following is a specification.

The present invention relates in general to transmitter supports for telephone transmitters; and the object of thek invention is to provide an improved device of this charac# ter embodying among other features a novel. and highly improved flexible joint.

The invention-is illustra-ted in the accom panying drawings, in which Fig. 1 is a side elevation of the transmitter support and transmitter assembled; complete, ready for attachment to a telephone boX.

Fig. 2 is a cross-section of the support with. the transmitter removed, onv the line a-b, Fig. 1.

Fig. `3 is a front view of the support with the transmitter removed.

Figs. 4; and 5 are details showing the con struction of the bolt and one ofy the lugs comprising the flexible joint.

The construction of the invention is `as follows: As illustrated in the drawings, it comprises a. rear supporting member' or bracket 1 adapted for attachment to the front of the wall telephone box, and a hinged shell 2 which forms a receptacle for the microphone 3. The bracket 1 is a casting, preferably of brass, and is provided with two threaded holes 4` and 5 which are adapted to receive the ends of two screws which may be inserted from inside the door `of the telephone to which the transmitter support is to be attached. As illustrated particularly in Fig. 2, the bracket is in general shaped more or. less like the frustrum of a cone and4 is hollowed out as shown to receive the shell. At the center of the concave portion ofthe bracket thef hollow post 6 is firmly attached either' by meansof the screw threads as shown, or by riveting or any other suitable means. Tf preferred, the post may be cast integrally with the bracket.

The shell 2 is drawn from heavy brass, steel, or other metal; to the shape. shown in the drawings, andv has a rectangular vopening 14 cut n the bottom, suliiciently large to Serial No. 523,491.

permit the easy entrance of post 6. On the opposite sides of this opening are attached lugs 7 and 8, which are secured to the shell by riveting. The post 6 has a transverse hole drilled through it near the end, and each of the lugs 7 and S are provided with holes which register with the hole in. the post when the shell is assembled in the position shown in Fig. 2. The bolt 11, which is used to clamp the parts togetherand which acts as a pivot for the shell, is shown in detail in Fig. 4, and has two small projections on the inner surface of the head which register with two small recesses cut in the lug 7, which may be seen clearly in. Fig. 5. This construction prevents the bolt from turning, and the nut from working loose. The nut 12 should' be turned up fairly tight in order to provide sucient friction ben tween the sides of the post 6 and the two lugs to hold the transmitter in any desired position.

Tn order to prevent the ill effects of wear on the frictional surfaces, Which. might otherwise cause the joint to become loose, the end of the post 6 is bifurcated as shown in the drawing, thus permitting the sides of the post to giveV slightly when the nut is tightened up on the bolt. Writh this construction, in which the two prongs of the post are held under1 tension, wear of the moving parts will be automatically taken Tt will be noticed that the bolt 11 is channelled out at the center for about one-third its length, which is done to permit the assembly of the parts. There is a transverse slot cut in the post 6 parallel to the bolt hole and extending from the end of the post clear through to the hole, as is seen. in Fig. 3. rThis slot is just wide enough to admit the channelled out portion of bolt 11, which may thus be removed or inserted by displacing it endwise ay very short distance, whereas if an ordinary boltl and unslotted post were used the bolt would have to` be inserted in the hole in the ordinary way-an impossible operation with a shell of the.

dimensions illustrated. It will be seen, then,

.that the arrangement used is necessary in the same contour as the surface 9.

tion involves the relation betwen the joint, or rather its location, and the cooperating surfaces of the bracket and shell. The surface portion 9 of the shell has the contour of a portion of the surface of a sphere whosev up and down adjustment are of course deterinined by the dimensions of the slot. 14. For instance, it will be evidentfroin Fig. 3 that if the transmitter is pulled down the lower end of the slot will engage the side of the post 6 and definitely stop the move* ment at a certain point. The raising of the transmitter is likewise stopped at a certain point by engagement of the upper end of the slot with the post, and it will be clear that movement between any desired limits can be provided for by making the slot of the required dimensions.

There are a number of advantages which may be obtained by using this improved form of joint. One advantage of considerable importance lies in the fact that the clearance between the shell and the bracket may be made very small, which renders the support more nearly dust-proof than other transmitter supports now in use. Another advantage is that the flexible cords which connect with the microphone transmitter are less liable to be damaged when the improved joint here illustrated is used. These wires are pulled through the hollow post 6 and pass one on each side of the bolt 11, the channelled out portion of which affords ample room for the wires. With this arrangement of the wiring, movement of the transmitter shell causes nothing beyond a simple bending of the wires, which are not doubl-ed up as in former arrangements, and consequently are less liable to be damaged. A still further advantage consists in the decided improvement in appearance. rlhe hinge, being inside of the shell` is entirely concealed from view, and the assembled support, therefore, has a very neat and artistic appearance.

While the invention is shown adapted for use in connection with a wall telephone, it

will be understood that with suitable modifications in the shape of the rear bracket it Obviously, also, the concave4 .bracket Afor attachment to a telephone, a

shell for :receiving a .'microphone, and a joint including a pin acting as its bearing connecting the said bracket and shell said joint and pin being located entirely within the said shell.

3. A transmitter support comprising a shell for receiving a microphone at one end, a fixed post entering an opening at the other end, lugs secured to the shell near said opening and extending parallel to said post inside the shell, and a bolt connecting said lugs and post to form a hinged joint whollj7 within the said shell.

4.-. A transmitter support comprising a microphone shell having one end shaped like a truncated sphere, a bracket having a concave depression for receiving the spherical end of said shell, and a joint connecting the said shell and bracket having its axis passing` through the geometrical center of the spherical portion of said shell.

5. A transmitter support comprising a bracket and a microphone shell, a hinged joint connecting the two and located wholly within the said shell, and cooperating convex and concave surfaces for the said shell and bracket, respectively, conforming substantially to the surface of an imaginary sphere whose center is at the center of said joint.

6. A transmitter support comprising a shell for receiving a microphone at one end, a' fixed post entering an opening in said shell at the other end, said post being bifurcated for a substantial portion of its length inside of the shell, lugs secured to the inside of the shell on opposite sides of said post, and a bolt clamping the said lugs and post together to form a hinged joint inside the shell, the two prongs of the post being held under tension to provide for automatically taking up wear between the frictional surfaces. i

7. A transmitter support comprising a shell for receiving a microphone at one end, a fixed post, entering an opening in said shell at the other end, said post having a hole near vthe end inside the shell, lugs secured to the insideof the shell on opposite sides of said post, said lugs having holes registering with the hole in said post, a bolt for clamping the lugs and post together to form a hinged joint, said bolt having a channel near the center, and a slot cut through the post and lugs to the Ysaid hole large enough to admit the channelled portion of said bolt.

8. A transmitter support comprising a shell for receiving a microphone at one end, a bracket having a depression therein for receiving the other end o'l' said shell, a member liXed to said bracket at one end and having its free end protruding through an opening in said shell, said opening being co-ncealed by said bracket, and a hinge joint Within the shell for connecting the shell to the free end of said member.

9. A transmitter support comprising an arm, a microphone shell pivotcd on said arm, and means lying wholly within the shell for attaching the shell to the arm.

10. A transmitter support comprising an arm, a microphone shell pivoted on said arm, and means lying wholly within the shell for changing the frictional relation between the arm and the shell.

11. A transmitter' support comprising a bracket and a microphone shell, and a hinged joint wholly within the shell including frietional means :tor holding` the shell and the said bracket in any relation to each other to which they have been moved.

12. In the combination of a telephone transmitter shell pivotally secured to a supporting bracket, means wholly within the shell for holding the shell in the position to which it has been moved with respect to the bracket.

13. A transmitter support comprising a shell having openings for receiving a microphone and a supporting bracket, a hinged joint connecting the shell and bracket, said hinged joint being accessible for repair and adjustment through the opening for receiving the microphone.

14. A transmitter support comprising a microphone shell formed from a single sheet of material and having one end shaped like a truncated sphere, a bracket having a concave depression for receiving the spherical end of said shell, and a hinged connection between the shell and bracket having its axis passing through the geometrical center of the spherical portion of said shell.

In Witness whereof, I hereunto subscribe my name this 17th day of December, A. D.,

HERBERT F. OBERGFELL. 

